Description

6-[2,4-Diamino-5-[(2-Hydroxy-5-Nitrophenyl)Azo]Phenoxy]-2-Naphthalenesulfonic Acid Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex molecular structure, featuring both azo and sulfonic acid groups, makes it a critical precursor for synthesizing specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid, colorfast hues with specific technical properties.

Application

This sodium salt azo intermediate is engineered for precision in advanced colorant synthesis. Its primary and derived applications include:

• Precursor for Acid Dyes: Key building block for manufacturing acid dyes used on protein fibers like wool, silk, and nylon.
• Specialty Pigment Synthesis: Used in the production of high-performance pigments for inks, coatings, and plastics requiring excellent lightfastness.
• Textile Dyeing: Imparts bright and stable colors in textile processing, particularly for synthetic and blended fabrics.
• Biological Staining: Potential use in the formulation of histological stains for microscopy, leveraging its chromophoric properties.
• Research & Development: Serves as a standard or intermediate in chemical research for developing new chromophores and functional dyes.
• Paper Coloring: Applicable in the manufacture of dyes for specialty paper products.

Basic Information

Product Name	6-[2,4-Diamino-5-[(2-Hydroxy-5-Nitrophenyl)Azo]Phenoxy]-2-Naphthalenesulfonic Acid Sodium Salt
CAS No.	6232-50-4
Molecular Formula	C22H16N5NaO7S
Molecular Weight	517.45 g/mol
Synonyms	Sodium 6-[2,4-diamino-5-[(2-hydroxy-5-nitrophenyl)diazenyl]phenoxy]naphthalene-2-sulfonate; 6-[2,4-Diamino-5-[(2-hydroxy-5-nitrophenyl)azo]phenoxy]-2-naphthalenesulfonic acid sodium salt; C.I. 18050; Acid Dye Intermediate; Azo Dye Sodium Salt; 2-Naphthalenesulfonic acid, 6-[2,4-diamino-5-[(2-hydroxy-5-nitrophenyl)azo]phenoxy]-, sodium salt (1:1)
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and purity for sensitive synthesis applications. Every lot is analyzed against rigorous in-house specifications, which typically include identity confirmation, assay/purity by HPLC, and control of key impurities. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.